A year later, the manufacturer releases NT2 and drops support for NT1. The zip file lives on in Google Drive and Telegram groups, sometimes with a warning: “Use v1.1.7, NOT v1.1.8 — that one bricks NT1 permanently due to wrong preloader.”
Using the unbricktool-OS-V1.1.7-NT1.zip file is relatively straightforward. Here's a step-by-step guide to unbrick your device: unbricktool-OS-V1.1.7-NT1.zip